Essentially, all accounting degrees will offer you the same foundations.
What really differs them is how they specialise. For example, where you can study Taxation as a second major at UNSW, you can't at Macquarie.
Other than those small things, the courses are very similar. If you look through the learning guides at each university you'll see very similar subjects. They have to teach you things like Taxation Law for instance, as to work as an accountant this is probably something you will come across on a regular basis.
I guess the main idea of Macquarie's professional accounting degree is for students to have a more focused approach to the accounting skill set, whereas at another uni like Sydney or UNSW they might share their focus with other skills, like Finance or Economics.
As well as this, most people studying accounting will look towards doing a CA or CPA. The ICCA has a list of subjects at a university level you will need to complete in order to undertake a CA:
http://www.charteredaccountants.com...Program/Entry-requirements/Accredited-courses
Really it comes down to where you believe you'll get the best education.
UNSW has a very good reputation for commerce and the quality of the teachers, so their courses are always very competitive and sought after. Usyd also has a good reputation, but is narrowly beaten by UNSW in the commerce stakes. This is why these courses need a 90+ ATAR, because so many people want to go there.
Macquarie hasn't got as strong of a reputation for commerce, but the focus on accounting could be seen as very desirable by employers too. If you were undertaking an accounting cadetship also, UNSW or Macquarie might appeal more to you as they offer part time degrees, and Mac has its city campus too. I believe only recently Usyd introduced a part time degree, so for many older students and employees in accounting firms, Usyd won't have been a popular choice (so you may not be able to get as much help from co-workers
)
You need to remember, UNSW & Usyd have had significantly longer than all other universities to establish themselves. There is a lot of reputation that people associate with them, particularly because they are part of the Go8 universities. Don't let this influence your decision though. Go to all the universities and ask questions and get a feel for what you think is best for you. If your not enjoying one university, you could always consider transferring to another at a later date!